#include <iostream>

//类型不明确
//#define max 100

//编译器定下来
const int Max = 100;

void func(int a)
{
    std::cout<<"int"<<std::endl;
}

void func(shord a)
{

}
void func(void*)
{
    std::cout<<"short"<< std::endl;
}

int main()
{
    //空指针
    func(nullptr);
    return 0;
}
